Equipment information
Fluke 895A Digital multimeter
Manufacturer:
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Model:
895A
Date:
1981
Category:
Group:
Description:
DC Differential Voltmeter
Information
The 895A DC Differential Voltmeter is half-rack size, and is
equipped with resilient feet and tilt-up bail for field or
bench use. A single instrument may be mounted in a standard
19 inch rack with metal handle-rack adapter kit 881A-102.
Two half-rack size instruments may be mounted side-by-side
with metal handle -rack adapter kit 881A-1Q3.
The 895A can be used as: (a) A conventional voltmeter for
rapid determination of dc voltages from 0 to ±1100 volts to
within ±3% of range setting, (b) A differential voltmeter
for precise measurement of dc voltages of 0 to ±1100 volts
to within ±(0. 0025% of input +0.0001% of range + 5 uv). (c)
A ratiometer for accurately determining the ratio of two
voltages, and (d) A megohmmeter for measurement of
resistance from 0.1 megohm to 10,000,000 megohms with a
typical accuracy of ±5%. The instrument can be used to
indicate voltage excursions about a nominal value. One
feature that should be emphasized is that no current is
drawn from the unknown voltage source, when the voltmeter is
at null, at up to 1100 volts. Thus, the determination of the
unknown potential is independent of its source resistance.
1-4. Leakage resistance of the 895A to ground is 100
megohms. The instrument contains a polarity switch for
convenience in measuring positive or negative voltages, or
in using the instrument as a ratiometer. A grounded recorder
output is included for monitoring the voltage being
measured. Shock, vibration, humidity, and tem -
perature testing verify a design that will provide years of
hard use under severe environmental conditions.
When used as a differential voltmeter, the 895A operates on
the potentiometric principle. An unknown voltage is measured
by comparing it to a known reference voltage with the aid of
a null detector. An accurate standard for measurement is
provided by an 1100 volt reference supply containing a pair
of temperature-controlled zener diodes. A five-dial
Kelvin-Varley voltage divider attenuates the reference
voltage as necessary to obtain a null condition. The unknown
voltage is then indicated by the setting of the voltage
readout dials.
Manual Type:
Service and User Manual
Pages:
73
Size:
4.95 Mbytes (5192876 Bytes)
Language:
english
Revision:
Manual-ID:
Date:
1981 06 01
Quality:
Scanned document, all readable.
Upload date:
2018 01 16
MD5:
b9086d34fefe6bab7c28c8321b9d8365
Downloads:
682
Information
1-1. Introduction ... 1-1
1-6. Input Power ... 1*1
1-8. Receiving Inspection ... 1-1
1-10. Specifications ... 1-2
2 OPERATING INSTRUCTIONS 2-1
2-1. Function of Controls, Terminals and
Indicators ... 2-1
2-3, Preliminary Operation ... 2-1
2-4. Zeroing Instructions ... 2-1
2-6. Operation as a Differential
Voltmeter ... 2-1
2-7. Operation as a Conventional Voltmeter ... 2-3
2-9. Measurement of Voltage Excursions About a
Nominal Value ... 2-3
2-10. Use with a Recorder ... 2-4
2-12. Measurement of High Resistance. . ... . . . 2-4
2-15. Use as a Ratiometer ... 2-5
2-17. Notes on Operation ... 2-6
3 THEORY OF OPERATION
3-1. Introduction ... 3-1
3-7. Circuit Descriptions ... 3-2
4 MAINTENANCE 4-1
4-1, Introduction ... 4-1
4-3. Test Equipment Required ... 4-1
4-5. Periodic Maintenance ... 4-1
4-8. Performance Testing ... 4-1
4-15. Calibration ... 4-4
4-26. Corrective Maintenance ... 4-5
5 OST OF REPLACEABLE PARTS 5-1
5-1, Introduction ... 5-1
5*3. Columnar Information ... 5-1
5-4. Flow to Obtain Parts ... 5-1
5-7. Abbreviations and Symbols ... 5-2
5-8. Serial Number Effectivity ... ... 5-21
6 ACCESSORIES 6-1
6-1. Precision Voltage Dividers ... 6-1
6-2. Isolation Amplifier ... 6-2
7 GENERAL INFORMATION 7-1
8 SCHEMATIC DIAGRAM 8-1